Current thresholds are CPU : 5000.0 Free RAM : 0 Free swap : 0 Rating : 0 Based on the CPU threshold and a comment in the code, it's likely it was originally intended to be used for the 1 min load average, which is a function of the number of CPUs. However, this number has been applied for the total CPU load, which never reaches above 1 (100%). Concerning memory thresholds, it's not very useful to warn when they're depleted.
This is likely redundant now with the reduced load balancer (bug 4429).
These values are no longer displayed in tlwebadm since bug 8542 due to reworking of the load balancer in bug 4429. The thresholds were also removed in the process as a consequence. Closing.